I know from personal experience a 688 SSN rolled quite alot @150ft depth when hurricane Bob was topside in Long Island Sound (1991). A lighter gato boat getting bounced around slightly while submerged deep in heavy seas isn't surpriseing at all.
In SH3 this was modled kinda close, even at 70m depth a type VII will move around slightly in heavy seas. On the other hand, in SH4 once under 60ft depth all hell could be breaking loose topside and one couldn't really tell in control.
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